THE RR LYRAE STARS: NEW PERSPECTIVES
| Autor: | J. Barnes, D. H. McNamara |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | The Astronomical Journal. 147:31 |
| ISSN: | 1538-3881 0004-6256 |
| DOI: | 10.1088/0004-6256/147/2/31 |
| Popis: | We demonstrate that the Oosterhoff II (Oo?II) RR Lyrae ab variables are hotter by ~270?K, at the same period, than Oo?I variables. Or, at the same (B ? V)0 value the Oo?II variables have larger radii than Oo?I variables. This accounts for the reason Oo?II variables are brighter (0.12-0.20?mag) than Oo?I variables. The dependence of the light amplitude of RR Lyrae variables on temperature is independent of Oo type. This makes it possible to derive an accurate set of equations to relate intrinsic (B ? V)0 color indices to light amplitudes, which in turn can be used to determine the interstellar reddening (E (B ? V)). With just a few variables (~5), it is possible to determine the E (B ? V) to an accuracy of |
| Databáze: | OpenAIRE |
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